<form method="post"      enctype="multipart/form-data">
    <label for="file">Name:</label>
    <input type="file" name="file" id="file"><br>
    <input type="submit" name="submit" value="Submit">
</form>
<?php
if (isset($_POST['submit'])) {
    $allowedExts = array("gif", "jpeg", "jpg", "png");
    $temp = explode(".", $_FILES["file"]["name"]);
    $extension = end($temp);
    if ((($_FILES["file"]["type"] == "image/gif")
            || ($_FILES["file"]["type"] == "image/jpeg")
            || ($_FILES["file"]["type"] == "image/jpg")
            || ($_FILES["file"]["type"] == "image/pjpeg")
            || ($_FILES["file"]["type"] == "image/x-png")
            || ($_FILES["file"]["type"] == "image/png"))
                                                                
            && in_array($extension, $allowedExts)) {
        if ($_FILES["file"]["error"] > 0) {
            echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
        } else {
            echo "Upload: " . $_FILES["file"]["name"] . "<br>";
            echo "Type: " . $_FILES["file"]["type"] . "<br>";
            echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
            echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br>";

            if (file_exists("./images/" . $_FILES["file"]["name"])) {
                echo $_FILES["file"]["name"] . " already exists. ";
            } else {
                move_uploaded_file($_FILES["file"]["tmp_name"], "./images/" . $_FILES["file"]["name"]);
                echo "Stored in: " . "./images/" . $_FILES["file"]["name"];
            }
            $hinh ="./images/".$_FILES["file"]["name"];
        }
    } else {
        echo "Invalid file";
    }
    echo "<img  src='$hinh' with = '100px'>";
}
?>
